US begins studying risk of allergic reactions to Moderna, Pfizer Covid-19 vaccines
A sign marks the headquarters of Moderna Inc, which is developing a vaccine against the coronavirus, in Cambridge, Massachusetts, US, May 18, 2020. Reuters/Brian Snyder/File Photo
The US National Institutes of Health said on Wednesday it had begun a mid-stage study to determine the risk of allergic reactions to Covid-19 vaccines made by Moderna Inc and Pfizer Inc.
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